EP0707384A1 - Dispositif de mesure de position - Google Patents

Dispositif de mesure de position Download PDF

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Publication number
EP0707384A1
EP0707384A1 EP95111727A EP95111727A EP0707384A1 EP 0707384 A1 EP0707384 A1 EP 0707384A1 EP 95111727 A EP95111727 A EP 95111727A EP 95111727 A EP95111727 A EP 95111727A EP 0707384 A1 EP0707384 A1 EP 0707384A1
Authority
EP
European Patent Office
Prior art keywords
code
scanning
resolution
measuring device
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95111727A
Other languages
German (de)
English (en)
Other versions
EP0707384B1 (fr
Inventor
Erich Strasser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dr Johannes Heidenhain GmbH
Original Assignee
Dr Johannes Heidenhain GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dr Johannes Heidenhain GmbH filed Critical Dr Johannes Heidenhain GmbH
Publication of EP0707384A1 publication Critical patent/EP0707384A1/fr
Application granted granted Critical
Publication of EP0707384B1 publication Critical patent/EP0707384B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/14—Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit
    • H03M1/16—Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit with scale factor modification, i.e. by changing the amplification between the steps
    • H03M1/161—Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit with scale factor modification, i.e. by changing the amplification between the steps in pattern-reading type converters, e.g. with gearings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/249—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using pulse code
    • G01D5/2497—Absolute encoders
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/22—Analogue/digital converters pattern-reading type
    • H03M1/24—Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip
    • H03M1/28—Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip with non-weighted coding
    • H03M1/285—Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip with non-weighted coding of the unit Hamming distance type, e.g. Gray code

Definitions

  • the invention relates to a position measuring device according to the preamble of claim 1.
  • a position measuring device is known from DE 33 22 897 C2, in which several code disks are coupled to one another via a reduction gear in order to measure a position absolutely over several revolutions.
  • the code tracks of a code disk each form a code group, the scanning of which creates a code word.
  • the absolute position is determined by combining the individual code words with different angular resolutions.
  • measures have become known in order to achieve synchronization between the scanning signals of two successive code groups. These measures are explained in detail in DE 33 22 897 C2, DE 37 34 938 C2, DE 29 38 318 C3 and DE 27 58 525 B1, to which express reference is made.
  • the object of the invention is to provide a position measuring device in which incorrect measurements are recognized in good time.
  • the angle measuring device consists of an input shaft 1, on which a first code disk 2 with four code tracks 3, 4, 5 and 6 is attached, which in a known manner with a scanning unit 7 is scanned electrically to determine the absolute position of the input shaft 1 within one revolution.
  • the input shaft 1 is coupled via a reduction gear 8 to a further shaft 9, to which a second code disk 10 is attached.
  • This code disk 10 also has a plurality of code tracks 11, 12, 13 and 14, which are scanned electrically by means of a further scanning unit 15.
  • the coding is preferably carried out in the Gray code. All code tracks 3 to 6 of the first code disk 2 form a first code group and all code tracks 11 to 14 of the second code disk 10 form a further code group, the first code group having a higher resolution than the further code group.
  • the analog scanning signals generated in the scanning units 7, 15 are triggered and fed as digital scanning signals A3 to A6 and A11 to A14 to an evaluation unit 16 to form the absolute position B.
  • the formation of the absolute position B by synchronization of the scanning signals A3 to A6 with A11 to A14 is explained in detail in the documents already mentioned in the introduction, so that only a brief explanation will be given for understanding the invention.
  • FIG. 2 shows the digitized scanning signals A3 to A6 of the first code group. It can be seen that the first three high-resolution scanning signals A 4 to A6 form a Gray code and the fourth scanning signal A3 is 90 ° out of phase with the third scanning signal A4, but has the same signal period as the scanning signal A4.
  • This scanning signal A3 is used for synchronization, ie for the correct connection of the scanning signals A3 to A6 and A11 to A14 of both code groups.
  • the code track 3, which is used to form the scanning signal A3, is therefore also referred to as the connecting track.
  • a tolerance range T1 is determined, for example, by a higher resolution scanning signal A5 of the higher-resolution code group is formed by checking whether the edge K lies within a predetermined logical level (for example 1) of the scanning signal A5. As soon as the edge K lies within a different level (for example 0) of the scanning signal A5, a warning signal F is emitted by the evaluation unit 16.
  • a tolerance range T2 Another possibility for defining a tolerance range T2 is to logically link a plurality of scanning signals A5 and A6.
  • a test signal L is generated by OR linkage.
  • a warning signal F is generated. This check can be done using a computer or using logical networks. It is particularly advantageous if the evaluation unit 16 for forming the warning signal F is an integral part of the position measuring device, so that the user can be checked for correct operation even during operation.
  • the two code groups to be synchronized do not have to be divided into separate material measures 2, 10.
  • the invention can also be used to synchronize two code groups with different resolutions on a single material measure. This may be necessary because the edge K of a scanning signal A14 can be shifted relative to the scanning signal A3 solely by frequency-dependent influences. This shift takes place, for example, solely by triggering due to the frequency dependence of the trigger levels.
  • the displacement will increase with rapid relative displacements between the measuring standard and a scanning unit, so that according to the invention, monitoring of the permissible speed, for example speed, is also possible.
  • the invention can be used for angle and linear measuring devices which are based on the photoelectric, capacitive, inductive or magnetic scanning principle.
  • the scanning units 7, 15 contain magnetoresistive elements or Hall elements for generating the scanning signals A3 to A6 and A11 to A14.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Body Structure For Vehicles (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Vehicle Body Suspensions (AREA)
EP95111727A 1994-10-13 1995-07-26 Dispositif de mesure de position Expired - Lifetime EP0707384B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4436496 1994-10-13
DE4436496A DE4436496A1 (de) 1994-10-13 1994-10-13 Positionsmeßeinrichtung

Publications (2)

Publication Number Publication Date
EP0707384A1 true EP0707384A1 (fr) 1996-04-17
EP0707384B1 EP0707384B1 (fr) 1999-10-27

Family

ID=6530605

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95111727A Expired - Lifetime EP0707384B1 (fr) 1994-10-13 1995-07-26 Dispositif de mesure de position

Country Status (3)

Country Link
EP (1) EP0707384B1 (fr)
AT (1) ATE186162T1 (fr)
DE (2) DE4436496A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19820014A1 (de) * 1998-05-06 1999-11-11 Heidenhain Gmbh Dr Johannes Multiturn-Codedrehgeber
DE10050392A1 (de) * 2000-10-12 2002-04-18 Heidenhain Gmbh Dr Johannes Positionsmesseinrichtung und Verfahren zum Betrieb einer Positionsmesseinrichtung
GB2417842B (en) * 2004-09-02 2006-08-16 Rotork Controls Improvements to a multi-turn shaft encoder
US9217559B2 (en) 2012-03-20 2015-12-22 Martin Professional A/S Moving head light fixture with yoke and head position encoding means

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2758525B1 (de) 1977-12-28 1979-06-28 Heidenhain Gmbh Dr Johannes Messeinrichtung mit codierter Unterteilung
US4183014A (en) * 1977-01-21 1980-01-08 Tri-N Associates, Inc. Absolute encoding apparatus
EP0212118A2 (fr) * 1985-08-10 1987-03-04 Dr. Johannes Heidenhain GmbH Dispositif électrique pour mesurer des longueurs ou des angles avec un montage de contrôle d'erreurs
DE2938318C2 (de) 1979-09-21 1988-05-26 Dr. Johannes Heidenhain Gmbh, 8225 Traunreut Meßeinrichtung
DE3322897C2 (fr) 1983-06-25 1989-05-03 Suetron Electronic Gmbh, 7024 Filderstadt, De
DE3734938A1 (de) * 1987-10-15 1989-05-03 Stegmann Uhren Elektro Sensoreinheit, insbesondere zum betrieb von elektrisch kommutierten synchronelektromotoren in servoregelkreisen
DE4120343A1 (de) * 1991-06-20 1992-12-24 Hohner Elektrotechnik Kg Messwertaufnehmer, insbesondere zur bestimmung der umdrehungsanzahl eines drehteiles

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4183014A (en) * 1977-01-21 1980-01-08 Tri-N Associates, Inc. Absolute encoding apparatus
DE2758525B1 (de) 1977-12-28 1979-06-28 Heidenhain Gmbh Dr Johannes Messeinrichtung mit codierter Unterteilung
DE2938318C2 (de) 1979-09-21 1988-05-26 Dr. Johannes Heidenhain Gmbh, 8225 Traunreut Meßeinrichtung
DE3322897C2 (fr) 1983-06-25 1989-05-03 Suetron Electronic Gmbh, 7024 Filderstadt, De
EP0212118A2 (fr) * 1985-08-10 1987-03-04 Dr. Johannes Heidenhain GmbH Dispositif électrique pour mesurer des longueurs ou des angles avec un montage de contrôle d'erreurs
DE3734938A1 (de) * 1987-10-15 1989-05-03 Stegmann Uhren Elektro Sensoreinheit, insbesondere zum betrieb von elektrisch kommutierten synchronelektromotoren in servoregelkreisen
DE3734938C2 (fr) 1987-10-15 1989-10-19 Max Stegmann Gmbh, Uhren- Und Elektroapparatefabrik, 7710 Donaueschingen, De
DE4120343A1 (de) * 1991-06-20 1992-12-24 Hohner Elektrotechnik Kg Messwertaufnehmer, insbesondere zur bestimmung der umdrehungsanzahl eines drehteiles

Also Published As

Publication number Publication date
ATE186162T1 (de) 1999-11-15
DE4436496A1 (de) 1996-04-18
DE59507133D1 (de) 1999-12-02
EP0707384B1 (fr) 1999-10-27

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